TaskbarViewController set window height to the too low value, so bubble
bar was not visible in 3 - buttons navigation mode on foldable device.
Fixes: 407708503
Test: Manual.
Use foldable device, set navigation mode to the 3 buttons. Fold the
device and trigger bubble. Lock screen. Unfold. Unlock screen. The
bubble remains visible.
Flag: EXEMPT bugfix
Change-Id: I516eab4121c39fc2bec5e49cc3c9b0ad8e640f8b
mpodolian
d3c7eed166